/*
 * Copyright 2002-2014 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package org.springframework.security.messaging.access.intercept;

import org.springframework.messaging.Message;
import org.springframework.security.access.ConfigAttribute;
import org.springframework.security.messaging.access.expression.ExpressionBasedMessageSecurityMetadataSourceFactory;
import org.springframework.security.messaging.util.matcher.MessageMatcher;

import java.util.*;

/**
 * A default implementation of {@link MessageSecurityMetadataSource} that looks up the {@link ConfigAttribute} instances
 * using a {@link MessageMatcher}.
 *
 * <p>
 * Each entry is considered in order. The first entry that matches, the corresponding {@code Collection<ConfigAttribute>}
 * is returned.
 * </p>
 *
 * @see ChannelSecurityInterceptor
 * @see ExpressionBasedMessageSecurityMetadataSourceFactory
 *
 * @since 4.0
 * @author Rob Winch
 */
public final class DefaultMessageSecurityMetadataSource implements MessageSecurityMetadataSource {
    private final Map<MessageMatcher<?>,Collection<ConfigAttribute>> messageMap;

    public DefaultMessageSecurityMetadataSource(LinkedHashMap<MessageMatcher<?>, Collection<ConfigAttribute>> messageMap) {
        this.messageMap = messageMap;
    }

    @SuppressWarnings({ "rawtypes", "unchecked" })
    public Collection<ConfigAttribute> getAttributes(Object object) throws IllegalArgumentException {
        final Message message = (Message) object;
        for (Map.Entry<MessageMatcher<?>, Collection<ConfigAttribute>> entry : messageMap.entrySet()) {
            if (entry.getKey().matches(message)) {
                return entry.getValue();
            }
        }
        return null;
    }

    public Collection<ConfigAttribute> getAllConfigAttributes() {
        Set<ConfigAttribute> allAttributes = new HashSet<ConfigAttribute>();

        for (Collection<ConfigAttribute> entry : messageMap.values()) {
            allAttributes.addAll(entry);
        }

        return allAttributes;
    }

    public boolean supports(Class<?> clazz) {
        return Message.class.isAssignableFrom(clazz);
    }
}
